<template>
  <view>
    
  <view class="search-box">
    <!-- 使用uni-ui提供的组件 -->
    <uni-search-bar @input="input" :radius="100" cancelButton="none" />
  </view>
    <!-- 搜索建议列表 -->
    <view v-if="searchResults.length !== 0" class="sugg-list">
      <view class="sugg-item" 
      v-for="(item,i) in searchResults"
      :key="i"
      @click="gotoDetail(item.goods_id)"
      >
        <view class="goods-name">
          {{item.goods_name}}
        </view>
          <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
  <!-- 搜索历史 -->
  <view v-if="searchResults.length == 0" class="history-box">
    <!-- 标题区域 -->
    <view class="history-title">
      <text>搜索历史</text>
      <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
    </view>
    <!-- 列表区域 -->
    <view class="history-list">
      <uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
    </view>
  </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //防抖的延时器的timerId
        timer:null,
        //搜索关键词
        kw:'',
        //搜索建议列表
        searchResults:[],
        //搜索关键词的历史记录
        historyList:[],
      };
    },
    methods:{
      input(e){
        //清除timer延时器
        clearTimeout(this.timer)
        // 重新启动一个延时器，并把 timerId 赋值给 this.timer
        this.timer = setTimeout(()=>{
            // 如果 500 毫秒内，没有触发新的输入事件，则为搜索关键词赋值
          this.kw=e,
          //根据关键词，查询搜索建议列表
          this.getSearchList()
        },500)
      },
      // 根据搜索关键词，搜索商品建议列表
     async  getSearchList(){
        //判断关键字是否为空
        if(this.kw === ''){
          this.searchResults = []
          return;
        }
        //不为空，发送请求
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      //跳转到商品详情界面
      gotoDetail(goods_id){
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+goods_id
        })
      },
      // 保存关键词到搜索历史中
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        //将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      //清空历史记录
      cleanHistory(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      //跳转到商品课表界面
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      },
    },
    computed:{
      historys(){
        return [...this.historyList].reverse()
      }
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index:999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    justify-content:space-between;
    align-items: center;
    font-size: 12px;
    padding: 13px 0 ;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
//搜索历史
.history-box{
  padding:0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
